[SWEA] 구구단 걷기

 

 

[문제]

https://swexpertacademy.com/main/code/problem/problemDetail.do?contestProbId=AYaf9W8afyMDFAQ9

SW Expert Academy

 

 

 

[소스 코드]

import java.io.*;
import java.util.*;
public class Solution {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int T = Integer.parseInt(br.readLine());
		for(int tc=1;tc<=T;tc++) {
			long n = Long.parseLong(br.readLine());
			if(!isPrime(n)) {
				System.out.println("#"+tc+" "+(n-1));
			}
			else {
				for(int i=(int)Math.sqrt(n);i>=1;i--) {
					if(n%i==0) {
						System.out.println("#"+tc+" "+((n/i+i)-2));
						break;
					}
				}
			}
		}
	}
	private static boolean isPrime(long n) {
		for(int i=2;i<=(int)Math.sqrt(n);i++) {
			if(n%i==0) {
				return true;
			}
		}
		return false;
	}
}